(noun)a phonecall,page,or conversation aimed at getting into your pants.Not an invite to a movie or dinner, not just coffee, not a casual or formal get-together, just a plain old-fashioned "let's fuck"

I woke at 4 a.m. with a massive hard-on. I picked up the phone and gave Ruthie a booty call. I wanted to mount her so very, very much. I had it REAL bad !

In football, "Booty call" was originally meant to describe a terrible audible at the line of scrimmage. The definition is ascribed to the many bumbling check-offs by hack USC quarterback and all-around moron, John David Booty.

Because the USC offensive line would often get "bent over" by the opposing defense after a Booty call, the term evolved to mean getting driven to Fudgetown on the salami train, and finally, it meant simply getting laid. "Booty call" is now defined as a regular, easy sex partner (usually female).

Q: Why the f*&k didn't you block for me on that play?!? I got whacked!!!

A: It wasn't my fault, yo, it was that go*%amned Booty call. Let's go get some pussy.

Back in the days of cowboys and indians. The cowboys would go out into the loan range for long periods of time, and come back with only the clothes on their back. This would mean they would be forced to strip down to there boots (which would be left on to avoid rattle snakes)to wash their clothes. Hence in order to avoid confusion with passers by, the cowboy would shout (or call if you will) "booty, booty" so people would be able to take measures to avoid seeing him.
ergo Booty Call

Alan: And that's how the term "booty call" came around.
Jake: Oh right.
Kandi: So when did it start to mean "casual sex"???